No she can’t win, but she is going to do as much damage as she can before she is forced out, that’s the way I see it now. She seems to be a Romney surrogate.
Bachmann's role is to tarnish Newt, and if successful, the romney pac's will fund her campaign with enough cash to then turn on perry.
She won't be a threat to mittens but is trying out for a position with his crew.